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9-14r=-13.1-r
We move all terms to the left:
9-14r-(-13.1-r)=0
We add all the numbers together, and all the variables
-14r-(-1r-13.1)+9=0
We get rid of parentheses
-14r+1r+13.1+9=0
We add all the numbers together, and all the variables
-13r+22.1=0
We move all terms containing r to the left, all other terms to the right
-13r=-22.1
r=-22.1/-13
r=1+8.27272727273/11.8181818182
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